US 4,765,656 · Granted 1988-08-23
Data carrier having an optical authenticity feature and methods for producing and testing said data carrier
The present invention relates to a data carrier (identification card, bank card, credit card, etc.) in which information is provided in an inner volume area by means of a laser beam, the information being visible in the form of changes in the optical properties of the carrier material due to an irreversible change in the material caused by the laser beam and to a method for producing the data carrier and for testing it.
Patent details
- Publication number
- US 4,765,656
- Filing date
- 1986-10-15
- Grant date
- 1988-08-23
- Assignee
- Gao Gesellschaft Fur Automation Und Organisation Mbh
- Inventor(s)
- BECKER; WOLFGANG, HIERWEGER; ALEXANDER, MERKLE; HANSJUERGEN, LOB; ERWIN, LASS; JOSEPH, KAULE; WITTICH
- CPC class
- B42D15/00
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